Cosmic ray generation by quasar remnants: constraints and implications |
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| Authors: | Elihu Boldt Michael Loewenstein |
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| Institution: | Astronomy Unit, Queen Mary and Westfield College, Mile End Road, London E1 4NS; DEMIRM, Observatoire de Paris, UMR8540, 61 Avenue de l'Observatoire, 75014 PARIS Cedex, France; IRAM, 300 Rue de la Piscine, F-38406 St. Martin d'Hères, France; Radioastronomisches Institut der Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany |
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| Abstract: | We report the first detection of CO in the bulge of M31. The 12CO (1–0) and (2–1) lines are both detected in the dust complex D395A/393/384, at 1.3 arcmin (～0.35 kpc) from the centre. From these data and from visual extinction data, we derive a CO luminosity to reddening ratio (and a CO luminosity to H2 column density ratio) quite similar to that observed in the local Galactic clouds. The (2–1) to (1–0) line intensity ratio points to a CO rotational temperature and a gas kinetic temperature of >10 K. The molecular mass of the complex, inside a 25-arcsec (100 pc) region, is 1.5×104 M⊙. |
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| Keywords: | methods: observational ISM: clouds dust extinction galaxies: individual: M31 radio lines: galaxies |
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